Specifications

groundnut oil manufacturing process
1.The residual: <1%
2.1st grade groundnut oil
3.Patent technology
4.Good taste oil

Groundnut Oil Manufacturing Process

Groundnut is a traditional kind of material for making edible oil. The whole groundnut oil manufacturing process machine contains three workshops: groundnut pretreatment workshop, groundnut oil extraction workshop and groundnut oil refining workshop.

 

1. Craft flow for groundnut pretreatment workshop

groundnut→ magnetic box → cleaning → husking machine→crusher → flaking roller→ cooker → oil presser/prepresser → to extraction workshop

 

Main Equipments of groundnut pretreatment workshop: 

 

1). Groundnut: The oil content in the groundnut is about 44-55%.

 

2). Magnetic box: Clearing the iron impurity which might be in the groundnut. 

Since in the following steps, the iron impurity will be harmful to the machines. 

 

3). Cleaning: Removing the stone or solid impurities in the groundnut, in case of they will influence the oil yield rate and desolventizing of wet meal in the next process. 

 

4). Husking machine: The shell of groundnut will reduce the oil yield and the quality of final oil, so the shell must be moved.

 

5). Crusher: The size of groundnut is big, so it's divided to 3-4 small piece. The small piece is suitable for flaking roller.

6). Flaking roller: This machine will broke the cell of groundnut and add the superficial area of the material.

7).  Cooker: The function of cooker is to adjust the water content and temperature of the material. Then the groundnut is suitable for oil pressing or solvent extraction.

8).  Oil Presser: This is a main machine in the whole groundnut pretreatment workshop. It helps to extract crude oil.

 

2.Craft flow for groundnut oil solvent extraction workshop

 

   solvent                                                                     

      ↓                                                                                  

extractor → mixed oil → 1st and 2nd evaporation  → stripping tower → crude groundnut oil

      ↓      

  Wet meal → DTDC toaster →groundnut cake

 

Main Equipments of groundnut oil solvent extraction workshop:

 

1). Solvent pumps: continuously spray solvent to the rotary-typr extractor.

 

2). Roary extractor: spray and soak the prepressed cake with solvent so that oil fats can be

dissolved in solvent (form miscella). After processing, you can get wet meal and miscella 

(mixed oil).

 

3). DTDC toaster: used to separate the solvent from the wet meal.

 

4). Miscella tank 1st: pump the miscella ( oil with solvent) into the miscella 1st, then add 10% saline water to it. The phospholipid and impurities in the miscella will react with the saline 

water, at last the reactant precipitate, reaching the goal of purifying.

 

5). Miscella tank 2nd: the purified miscella will be pumped into it.

 

6). Miscella stripping: it will remove the remaining solvent in miscella. And the solvent will 

be discharged to condenser for recycling.

 

7). Condensers: used to cooling the solvent gas separated from the wet meal and miscella for 

recycling.

 

 

3. Craft flow for groundnut oil refining workshop

 

Crude groundnut oil → degumming and deacidification→ decolorization →deodorization

→ refined groundnut oil.

 

Main Process of groundnut oil refining workshop:

 

1). Degumming and deacidification: The gumming is moved by phosphoric acid and hot 

water. There are two ways to move the acid in the groundnut oil. One is chemical way, the 

other one is physical way. The chemical way is using NaOH to react with acid. This way is

suitable for the capacity of 5-30T per day. The physical way is using steam and centrifugal 

to move the acid. This way is used for capacity from 30-2000T per day.

 

2). Decolorization: This step is used to adjust the color of the oil. You can control the color of the groundnut according to the requirement of your market.

 

3). Deodorization: The function of this step is to move the special smell in the oil. This is an 

important standard for  refined oil.

 

 

 

 

the specification of crude groundnut oil

 

Item	Standard
Smell and taste	The original smell and taste of groundnut oil
Moisture and volatile matter (%)           ≤	0.20
Insoluble impurities (%)                            ≤	0.20
Acid value (mgKOH/g)                         ≤	4.0
Peroxide value (mmol/kg)                      ≤	7.5

 

 

the specification of refined groundnut oil

 

Item	Standard
Color (Lovibond Cell 133.4mm)             ≤	R3.5  Y35
Smell and taste                                ≤	No smell and good taste
Transparence                                   ≤	Clear and transparent
Moisture and volatile matter (%)        ≤	0.05
Insoluble impurities (%)                         ≤	0.05
Acid value (mgKOH/g)                      ≤	0.20
Peroxide value (mmol/kg)                   ≤	5.0
Smoke point (°C)                             ≥	215